| 摘要 |
A Trunked Private Mobile Radio (PMR) system which includes a fixed radio network which includes base stations PS1, PS2 and PS3 linked by land line or microwave connections, and in radio communication with mobile stations SS1 - SS7. A group call is set up with mobile stations SS2 and SS7 having a full duplex connection (via the fixed radio network) to each other, and all the remaining mobile stations listening in over simplex half-duplex connections. The radio system operates to rebroadcast the speech signals from mobile stations SS2 and SS7 over the half-duplex radio connections to the remaining mobile stations in the group, so that those mobile stations can listen in to the combined speech of the full duplex call. |
